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GET /api/patches/2226007/?format=api
{ "id": 2226007, "url": "http://patchwork.ozlabs.org/api/patches/2226007/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-13-yi.zhang@huaweicloud.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260422021042.4157510-13-yi.zhang@huaweicloud.com>", "list_archive_url": null, "date": "2026-04-22T02:10:32", "name": "[v3,12/22] iomap: support invalidating partial folios", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "5ef19296906bfcf04632ac1eb74a6ec9c725db33", "submitter": { "id": 85428, "url": "http://patchwork.ozlabs.org/api/people/85428/?format=api", "name": "Zhang Yi", "email": "yi.zhang@huaweicloud.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260422021042.4157510-13-yi.zhang@huaweicloud.com/mbox/", "series": [ { "id": 500911, "url": "http://patchwork.ozlabs.org/api/series/500911/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500911", "date": "2026-04-22T02:10:23", "name": "ext4: use iomap for regular file's buffered I/O path", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/500911/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226007/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226007/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=cZjX=CV=vger.kernel.org=linux-ext4+bounces-15975-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ext4@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1776824226; c=relaxed/simple;\n\tbh=SGgAVzQKlalx4575A8xE0nJS4/9k31qQPrfyU/eUHtI=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=aASOaVDemB56ndcIMtNG20u/LtrIQfPwcbqDVyFphpsRq/UHPnn6QLmGeJsmA0gxzFuMJuBkrIMkdLa0WiX54u47aYK8LXEdXsWebm2wze0t8aFYRJjZ33HBSoNlsbzK7PF7Ut+aRnF4EZ16oOBDD/30cbVMj5TiWlOxwoSozNk=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15975-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51" ], "From": "Zhang Yi <yi.zhang@huaweicloud.com>", "To": "linux-ext4@vger.kernel.org,\n\tlinux-fsdevel@vger.kernel.org", "Cc": "linux-kernel@vger.kernel.org,\n\ttytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlibaokun@linux.alibaba.com,\n\tjack@suse.cz,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tdjwong@kernel.org,\n\thch@infradead.org,\n\tyi.zhang@huawei.com,\n\tyi.zhang@huaweicloud.com,\n\tyizhang089@gmail.com,\n\tyangerkun@huawei.com,\n\tyukuai@fnnas.com", "Subject": "[PATCH v3 12/22] iomap: support invalidating partial folios", "Date": "Wed, 22 Apr 2026 10:10:32 +0800", "Message-ID": "<20260422021042.4157510-13-yi.zhang@huaweicloud.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260422021042.4157510-1-yi.zhang@huaweicloud.com>", "References": "<20260422021042.4157510-1-yi.zhang@huaweicloud.com>", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CM-TRANSID": "_Ch0CgB3JL6PL+hpqkgUBQ--.2635S16", "X-Coremail-Antispam": "1UD129KBjvJXoW7uF1xtrW5Jw48tw18Kr4fAFb_yoW8CryrpF\n\tW3KrWDGryDGr17uw47Ca1fXF1j9a9xXFy7CFW3Gw1a9Fs8Jw1qgFy7Ka1YgayUJryxAF1S\n\tvrsFgFyvqF15A3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUmS14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0\n\trVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_JF0E3s1l82xGYI\n\tkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2\n\tz4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F\n\t4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AKxVW0oVCq\n\t3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7\n\tIYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4U\n\tM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628vn2\n\tkIc2xKxwCY1x0262kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkE\n\tbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67\n\tAF67kF1VAFwI0_GFv_WrylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW8JVW5JwCI\n\t42IY6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF\n\t4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8Jr0_Cr1UYxBI\n\tdaVFxhVjvjDU0xZFpf9x0JUWMKtUUUUU=", "X-CM-SenderInfo": "d1lo6xhdqjqx5xdzvxpfor3voofrz/", "X-Spam-Status": "No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_MISSING,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "From: Zhang Yi <yi.zhang@huawei.com>\n\nCurrent iomap_invalidate_folio() can only invalidate an entire folio. If\nwe truncate a partial folio on a filesystem where the block size is\nsmaller than the folio size, it will leave behind dirty bits for the\ntruncated or punched blocks. During the write-back process, it will\nattempt to map the invalid hole range. Fortunately, this has not caused\nany real problems so far because the ->writeback_range() function\ncorrects the length.\n\nHowever, the implementation of FALLOC_FL_ZERO_RANGE in ext4 depends on\nthe support for invalidating partial folios. When ext4 partially zeroes\nout a dirty and unwritten folio, it does not perform a flush first like\nXFS. Therefore, if the dirty bits of the corresponding area cannot be\ncleared, the zeroed area after writeback remains in the written state\nrather than reverting to the unwritten state. Fix this by supporting\ninvalidation of partial folios.\n\nSigned-off-by: Zhang Yi <yi.zhang@huawei.com>\nReviewed-by: Darrick J. Wong <djwong@kernel.org>\n---\nThis is cherry picked form:\n https://lore.kernel.org/linux-fsdevel/20240812121159.3775074-3-yi.zhang@huaweicloud.com/\nNo code changes, only update the commit message to explain why Ext4\nneeds this.\n\n fs/iomap/buffered-io.c | 2 ++\n 1 file changed, 2 insertions(+)", "diff": "diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c\nindex 7e7d5b776d35..b17296b61a6e 100644\n--- a/fs/iomap/buffered-io.c\n+++ b/fs/iomap/buffered-io.c\n@@ -761,6 +761,8 @@ void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len)\n \t\tWARN_ON_ONCE(folio_test_writeback(folio));\n \t\tfolio_cancel_dirty(folio);\n \t\tifs_free(folio);\n+\t} else {\n+\t\tiomap_clear_range_dirty(folio, offset, len);\n \t}\n }\n EXPORT_SYMBOL_GPL(iomap_invalidate_folio);\n", "prefixes": [ "v3", "12/22" ] }